Lead-adjusting mechanism for band-saw guides.



No. 833,690. PATENTED OCT. 16, 1906.

. F. T..MoDONOUGH.

LEADADJUSTING MECHANISM FOR BAN D SAW GUIDES.

' APPLEATION FILED PEB.15.1906.

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PATENTED OCT. 16, 1906.

V P. T. MoDONOUGH. LEAD ADJUSTING MECHANISM FOR BAND SAW GUIDES.

APPLICATION FILED ma. 15. 1905.

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UNITED STATES PATENT OFFICE.

LEAD-ADJUSTING MECHANISM FOR BAND-SAW GUIDES.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed February 15,1905. Serial No. 245,789.

To all whom it may concern:

Be it known that I, FRANCIS THOMAS Mo- DONOUGH, a citizen of the United States, residing at Eau Claire, in the county of Eau Claire and State of Wisconsin, have invented a new and useful Lead-Adjusting Mechanism for Band-Saw Guides, of which the following is a specification.

The invention relates to lead-adjusting mechanism for upper and lower band-saw guides.

The object of the present invention is to improve the construction of band-saw guides, more especially the manner of mounting the upper and lower guides for double-edged saws, and to provide simple, inexpensive, and efiicient means for adjusting the lead of the saw to counteract any tendency of the saw to crowd in either direction, whereby lumber may be sawed with absolute accuracy.

A further object of the invention is to provide lead-adjusting mechanism adapted to be actuated by hand while a band-saw machine is in operation and capable of horizontally swinging the band-saw guide on the center of the effective or cutting portion of the bandsaw without bending the same longitudinally and without liability of stripping the same off the wheels.

With these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size, and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings, Figure 1 is a plan view of a portion of a band-saw mill provided with lead-adjusting mechanism constructed in accordance with this invention. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical sectional View. Fig. 4 is a horizontal sectional view. Fig. 5 is a detail sectional View on the line 5 5 of Fig. 3.

Like numerals of reference designate corresponding parts in all the figures of the drawm s.

1 designates an upper band-saw guide receiving a double-edged band-saw 2 in the usual manner and hung from a band-saw mill by means of parallel oscillatory hangers 3, adapted to swing in either direction when the upper guide is struck by a log to prevent injury to the upper guide. In the accompanying drawings the improved saw-guide-adjusting mechanism is shown applied to an upper guide only; but it willbe readily apparent that it is equally applicable to lower band-saw guides. The upper ends of the hangers are provided with openings to receive rigid horizontal pivots 4, and the lower ends of the links are provided with openings for the reception of screws 5 and 6. The screws'5 and 6, which are disposed horizontally at diflerent distances from the axis of the swinging motion of the saw-guide, are arranged eccentrically with relation to the saw and are provided at their outer ends with eyes 7 and 8 for the reception of vertical pivots 9 and 10, which secure the upper guide to the outer ends of the screws. The upper guide is provided with horizontal bearing openings or recesses for the reception of the outer ends of the screws, and it has vertical openings for the pivots or pintles 9 and 10. By this construction the upper saw-guide is pivotally connected with the outer ends of the screws and is rigidly held in position.

The horizontally-dis osed screws form adjustable supports for t 6 up er guide, and in order to enable the lead of t e saw to be controlledmeans are provided for adjusting the screws simultaneously to swing the u per saw-guide horizontally on the center the eiiective or cutting portion of the bandsaw, whereby any tendency of the saw to crowd in either direction is counteracted and absolute accuracy is secured. In order to secure this result, the screws and 6 are provided with threads of different size and pitch and are engaged by worm-gears 11 and 12, having threaded openings to correspond with the threads of the screws and located in lower slots or openings 13 of the links or hangers 3. The worm gears, which constitute nuts, mesh with a horizontally-disposed wormshaft 14, provided at op osite sides of its center with worms 15 an 16 and having a hand-wheel 17. The horizontal operatingshaft 14 is journaled in a bearing 18 of a bracket 19, which is mounted on a support 20, consisting of a bottom cross-piece of an emergency-valve-operating frame 21, mounted on the lower pivots or screws of the hangers and adapted to operate in the same manner as the emergency-valve-operating frame described and claimed in an application filed 1 supports for swinging the saw-guide horiby me on or about the 20th day of January, 1904, Serial No. 189,831. However, the operating-shaft may be mounted in any other desired manner and the lead-adjusting mechanism herein ShOW'Il and described, while being particularly applicable to guides hung from parallel hangers or links, is also susceptible of being advantageously em ployed for adjusting guides supported in various other ways. In the present construction the saw-guide-supporting screws also serve as pivots for connecting the sawguide to the links.

The gearing for imparting a differential movement to the spaced saw-guide supports or screws may be varied to adapt it to the character of band-saw mills to which the lead-adjusting mechanism is to be applied. The bracket which is bolted to the bottom of the frame 21 is provided with a flat back plate or portion, and it has vertical and horizontal webs or flanges for connecting the bearing portion with the back. The worms 15 and 16, which are located at the ends of the bearing portion of the bracket, fit against the same and hold the shaft against longitudinal movement, but any other suitable means may be employed for effecting this result.

The threads of the screw 6 are coarser than those of the screw 5, and when the operatingshaft is turned the screw 6 will be moved a greater distance than the screw 5, as it is a greater distance from the center on which the sawguide turns. This adjustment of the upper saw-guide may be made while a band-saw mill is in operation, and as the engaged portion of the saw is turned on its center there is no liability of injuring the same or of stripping the saw off the wheels. The worms which mesh with the worm-gears form lugs for holding the screws against accidental movement, so that the rigid supports for the saw-guide are provided.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a device of the class described, the combination with a saw-guide, of spaced supports for the guide located at different distances fromthe axis of the swinging motion of the latter, and means for differentially adjusting1 the supports for swinging the sawguide orizontally.

2. In a device of the class described, the combination with a saw-guide, of spaced supports for the guide, and means for imparting a differential motion to the supports for swinging the saw-guide horizontally.

3. In a device of the class described, the combination with a saw-guide, of spaced supports pivotally connected with the sawguide and located at difierent distances from the axis of the swinging motion of the same, and means for differentially adjusting the zontally.

1. In a device of the class described, the combination with a saw-guide, of spaced su ports located at different distances from t e axis of the swinging motion of the saw-guide and pivotally connected to the same, and means for simultaneously differentially adjustingthe supports for swinging the sawguide horizontally.

5. In a device of the class described, the combination with a saw-guide, of spaced screws supporting the guide and located at different distances from the axis of the swinging motion of the latter, and means for differentially moving the screws for swinging the saw-guide horizontally.

6. In a device of the class described, the combination with a saw-guide, of spaced supporting-screws located at different distances from the axis of the swinging motion of the saw-guide, nuts engaging the screws, and means for operating the nuts and for imparting a differential movement to the screws.

7. In a device of the class described, the combination with a saw-guide, of means for swinging the saw-guide horizontally, said means embodying spaced supporting-screws having threads of different pitch and connected with the saw-guide at different distances from theaxis of the swinging motion of the latter, worm-gears having threaded openings and forming nuts for engaging the screws, and a worm shaft engaging the worm-gears and adapted to rotate the same.

8. In a device of the class described, the combination of a saw-guide, spaced supporting-screws having threads of different pitch, nuts provided with threads corresponding with those of the screws and engaging the same, and means for simultaneously rotating the nuts for imparting a differential motion to the screws.

9. In a device of the class described, the combination of a saw-guide, and spaced os cillatory hangers, of pivots connecting the saw-guide with the hangers and located at different distances from the axis of the swinging motion of the said saw-guide, and means for differentially adjusting the pivots for swinging the saw-guide horizontally.

10. In a device of the class described, the

combination with a saw-guide, and spaced oscillatory hangers, of pivots carried by the hangers for connecting the saw-guide with the hangers, said pivots being hinged to the saw-guide at different distances from the axis of the swinging motion of the latter, and means for imparting a differential longitudinal motion to the pivots for swinging the saw-guide horizontally.

11. In a device of the class described, the combination with a saw-guide, and spaced ,oscillatory hangers, of pivots connecting the IIf saw-guide with the hangers at different distances from the axis of the swinging motion of the said saw-guide, a bearing-bracket located between the hangers, an operatingshaft mounted on the bearing-bracket, and means for communicating differential motion from the operating-shaft to the said pivots for swinging the saw guide horizontally,

12. In a device of the class described, the combination with a saw-guide, and spaced oscillatory hangers, of pivots connecting the saw-guide with the hangers at different distances from the axis of the swinging motion of the said saw-guide, a frame supported by the pivots, a bracket mounted on the frame, an operating-shaft mounted on the bracket, and means for imparting differential motion from the operating shaft to the pivots, whereby the saw-guide will be swung horizontally.

13. In a device of the class described, the combination with a saw-guide, and spaced oscillatory hangers provided with openings, of pivots connecting the saw-guides with the hangers at different distances from the axis of the swinging motion of the saw-guide and provided with threads of diflerent pitch, gears located in the openings of the hangers and provided with threads engaging those of the pivots, and means for simultaneously operating the gears.

14. In a device of the class described, the

combination with a saw-guide, of spaced supports for the guide arranged eccentrically with relation to the saw and at different 16. In a device of the class described, the i combination with a saw-guide, of means for swinging the saw guide horizontally embodying spaced supports for the guide located at different distances from the axis of the swinging motion of the latter, and means for differentially reciprocating the supports.

17. In a device of the class described, the combination with a saw-guide, of means for swinging the saw-guide horizontally, said means embodying spaced supports for the guide located at different distances from the axis of the swinging motion of the latter, and means for simultaneously moving said supports different distances.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

FRANCIS THOMAS MODONOUGH.

Witnesses:

Ms. W. HUBBARD, B. HOGAN. 

